The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 1980
Filed:
May. 14, 1979
Francis H Shepard, Jr, Summit, NJ (US);
R & I Patent Corporation, Morristown, NJ (US);
Abstract
A servomechanism comprising an operational amplifier; a servomotor driven by the amplifier, the amplifier having limited output voltage and current capabilities, i.e. being non-linear; a position sensor; and a position error detector. A negative feedback circuit integrates the limited amplifier output and mixes it with the error signal so as to produce, in the output of the amplifier, a signal proportional in voltage-time product to a derivative of error, even when the output amplitude is limited. Therefore the servo is positioned in the minimum possible time commensurate with the limited capability of the amplifier, without overshoot or undershoot. During an extended slew, the error signal output of the position error detector also becomes limited. Hence, shorting means are provided to prevent undue build-up of the integrated amplifier output feedback signal during this time, and to short a DC feedback blocking capacitor.